代码动态控制TextView右移（而不是xml）

TextView布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/class_rv"
    android:layout_marginRight="10dp"
    android:layout_marginBottom="10dp"
    android:background="@drawable/selector_class"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/tv_title"
        android:text="@string/about"
        android:textColor="@color/black"
        android:padding="5dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/select_iv"
        android:layout_toRightOf="@id/tv_title"
        android:layout_alignParentBottom="true"
        android:src="@mipmap/youxiajiao"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

代码控制，因TV的父布局为RelativeLayout，所以需要强转为(RelativeLayout.LayoutParams)

//            动态设置TextView位置
            RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) myHolder.tv_title.getLayoutParams();
            layoutParams.leftMargin=40;
            myHolder.tv_title.setLayoutParams(layoutParams);